Gas analyzer calibration

A method using a mixture of background gases with specific pressure broadening coefficients allows for accurate gas analyzer calibration, addressing the challenges of toxic or difficult background gases in industrial settings, enhancing detection precision and safety.

US12523641B2Active Publication Date: 2026-01-13BAKER HUGHES CO
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Patent Information

Application Number
US17/848067
Authority / Receiving Office
US · United States
Patent Type
Patents(United States)
Current Assignee / Owner
Filing Date
2022-06-23
Publication Date
2026-01-13
Estimated Expiration
2044-10-18

AI Technical Summary

Technical Problem

Calibrating gas analyzers in industrial settings is challenging due to the presence of toxic, expensive, or low vapor pressure background gases, which complicates the absorption spectrum of target gases and reduces accuracy, and existing methods struggle to find practical or cost-effective substitutes for these gases.

Method used

A method involving the use of a mixture of two background gases with specific pressure broadening coefficients to mimic the effect of a target background gas, allowing calibration in a controlled environment, using a weighted average to derive an effective absorption spectrum for accurate gas analysis.

Benefits of technology

Enables accurate and safe calibration of gas analyzers by mimicking the absorption spectrum of challenging background gases, improving detection accuracy and reducing operational risks and costs.

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Abstract

A calibration method includes receiving data characterizing a first pressure broadening coefficient, a second pressure broadening coefficient and a third pressure broadening coefficient of the target gas absorption associated with a first background gas, a second background gas and a third background gas, respectively. The method further includes, determining a molar ratio associated with the second background gas and the third background such that an effective pressure broadening coefficient associated with a target gas mixture including the second background gas and the third background gas mixed at the determined molar ratio is within a predetermined threshold of the first broadening coefficient. The target gas mixture further includes a target gas. The method also includes calibrating a gas analyzer using the target gas mixture to replace the calibration of the target in the first background gas. The calibration is based on absorption of electromagnetic radiation by the target gas in the target gas mixture.
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